57 lines
1.2 KiB
Markdown
57 lines
1.2 KiB
Markdown
---
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mapped_pages:
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- https://www.elastic.co/guide/en/elasticsearch/plugins/current/analysis-kuromoji-stemmer.html
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---
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# kuromoji_stemmer token filter [analysis-kuromoji-stemmer]
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The `kuromoji_stemmer` token filter normalizes common katakana spelling variations ending in a long sound character by removing this character (U+30FC). Only full-width katakana characters are supported.
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This token filter accepts the following setting:
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`minimum_length`
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: Katakana words shorter than the `minimum length` are not stemmed (default is `4`).
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```console
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PUT kuromoji_sample
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{
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"settings": {
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"index": {
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"analysis": {
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"analyzer": {
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"my_analyzer": {
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"tokenizer": "kuromoji_tokenizer",
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"filter": [
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"my_katakana_stemmer"
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]
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}
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},
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"filter": {
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"my_katakana_stemmer": {
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"type": "kuromoji_stemmer",
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"minimum_length": 4
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}
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}
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}
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}
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}
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}
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GET kuromoji_sample/_analyze
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{
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"analyzer": "my_analyzer",
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"text": "コピー" <1>
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}
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GET kuromoji_sample/_analyze
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{
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"analyzer": "my_analyzer",
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"text": "サーバー" <2>
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}
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```
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1. Returns `コピー`.
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2. Return `サーバ`.
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